US7021777B2 - Optical devices particularly for remote viewing applications - Google Patents
Optical devices particularly for remote viewing applications Download PDFInfo
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- US7021777B2 US7021777B2 US10/937,185 US93718504A US7021777B2 US 7021777 B2 US7021777 B2 US 7021777B2 US 93718504 A US93718504 A US 93718504A US 7021777 B2 US7021777 B2 US 7021777B2
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Images
Classifications
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/0081—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00 with means for altering, e.g. enlarging, the entrance or exit pupil
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/017—Head mounted
- G02B27/0172—Head mounted characterised by optical features
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/01—Head-up displays
- G02B27/0101—Head-up displays characterised by optical features
- G02B2027/0123—Head-up displays characterised by optical features comprising devices increasing the field of view
- G02B2027/0125—Field-of-view increase by wavefront division
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/18—Diffraction gratings
-
- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
Definitions
- the present invention relates to optical devices, and in particular to devices whereby an object is viewed remotely, with a large field-of-view (FOV) and in which the system aperture is limited by various constrains.
- FOV field-of-view
- the invention can advantageously be implemented in a large number of imaging applications, such as periscopes, as well as head-mounted and head-up displays.
- HMDs head-mounted displays
- HUDs head-up displays
- instrumentation is needed to collect light from the object, to transport the light to a location more favorable for viewing, and to dispense the light to the viewing instruments or to the eye of the viewer.
- image transportation techniques in common use today.
- One possible transportation method is to sense the image with a camera and transport the data electronically into a display source that projects the image.
- the resolution of both the camera and the display source is usually inferior compared to the resolution of the eye.
- Another method is to transport the light pattern with a coherent fiber optics bundle. This method is, however, adequate for systems with very small apertures only.
- the resolution of a fiber optics bundle is even more inferior than that of the electronic imaging system mentioned above.
- An alternative method is to transport the light pattern with a relay lens or a train of relay lenses. While the last mentioned method is the most commonly used for many applications, and can usually supply the user with a sharp and bright image, it still suffers from some drawbacks. Primarily, the optical module becomes complicated and expensive, especially for optical systems, which require high performance.
- the present invention facilitates the structure and fabrication of very simple and high-performance optical modules for, amongst other applications, periscopes.
- the invention allows systems to achieve a relatively high FOV while maintaining a compact and simple module.
- the optical system offered by the present invention is particularly advantageous because it can be readily incorporated even into optical systems having specialized configurations.
- the invention also enables the construction of improved HUDs in aircrafts, as well as ground vehicles, where they can potentially assist the pilot or driver in navigation and driving tasks.
- State-of-the-art HUDs nevertheless, suffer from several significant drawbacks. Since the system stop, which is usually located at the external surface of the collimating lens, is positioned far from the viewer's eyes, the instantaneous field-of-view (IFOV) is significantly reduced. Hence, in order to obtain a more desirable IFOV, a very large collimating lens is required, otherwise a much smaller IFOV will be obtained. As a result, the present HUD systems are either bulky and large, requiring considerable installation space which is inconvenient, and at times, even unsafe, or suffer from limited performance.
- An important application of the present invention relates to its implementation in a compact HUD, which alleviates the aforementioned drawbacks.
- the total volume of the system is significantly reduced while retaining the achievable IFOV.
- the overall system is very compact and can readily be installed in a variety of configurations for a wide range of applications.
- a further application of the present invention provides a compact display with a wide FOV for HMDs, whereby an optical module serves both as an imaging lens and a combiner and a two-dimensional display is imaged to infinity and reflected into the eye of an observer.
- the display can be obtained directly, either from a cathode ray tube (CRT) or a liquid crystal display (LCD), or indirectly, by means of a relay lens or an optical fiber bundle.
- the display is comprised of an array of points, imaged to infinity by a collimating lens and transmitted into the eye of a viewer by means of a partially reflecting surface acting as a combiner.
- a conventional, free-space optical module is used for these purposes.
- the optical module becomes heavier, bulkier and very complicated to use. This is a major drawback in head-mounted applications wherein the system should be as light and compact as possible.
- the overall optical systems are usually very complicated and difficult to manufacture with these designs.
- the eye-motion-box of the optical viewing angles resulting from these designs is usually very small—typically less than 8 mm.
- the performance of the optical system is very sensitive even to small movements of the visor relative to the eye of the viewer.
- the present invention facilitates the structure and fabrication of very compact HMDs.
- the invention allows relatively wide FOVs together with relatively large eye-motion-box values.
- the resulting optical system offers a large, high-quality image, which also accommodates large movements of the eye.
- the present invention is particularly advantageous for substrate-mode configurations, i.e., for a configuration comprising a light-transmitting substrate having at least two major surfaces and edges, optical means for coupling light from the imaging module into the substrate by total internal reflection, and at least one partially reflecting surface located in the substrate for coupling the light onto the viewer's eye.
- the combination of the present invention with a substrate-mode configuration can yield a very compact and convenient optical system along with a large IFOV and large eye-motion-box.
- a broad object of the present invention is to alleviate the drawbacks of state-of-the-art optical devices and, in particular, remote viewing display devices, and to provide optical devices and systems with improved performance.
- the invention therefore provides an optical device for transferring light within a given field-of-view, comprising an input aperture; reflecting surfaces, and an output aperture located in spaced-apart relationship from said input aperture such that light waves, located within the said field-of-view, that enter the optical device through said input aperture, exit the optical device through said output aperture, and characterized in that said reflecting surfaces are at least one pair of parallel reflecting surfaces and that part of said light waves located within said field-of-view that enter the input aperture, pass directly in free space to the output aperture without being reflected, while another part of the light waves within said field-of-view that enters the input aperture, arrives at the output aperture after being twice reflected by said at least one pair of parallel reflecting surfaces.
- FIG. 1 is a side view of the simplest form of a prior art periscope structure
- FIG. 2 is a schematic diagram illustrating an unfolded optical layout of a prior art periscope structure
- FIG. 3 is a side view of a prior art substrate mode folding optical device for HUD and HMD;
- FIG. 4 is a schematic diagram illustrating an optical layout according to the present invention, utilizing two pairs of parallel reflecting mirrors for achieving a wide FOV;
- FIG. 5 is a diagram illustrating a substrate mode folding optical device for HUD and HMD, according to the present invention.
- FIGS. 6A and 6B illustrate side and top view of an optical device in accordance with the present invention, showing the light waves as coupled into a substrate-mode element.
- Remote viewing optical systems and periscopes in particular, are optical systems designed to displace the object space reference point away from the eye space reference point. This allows the observer to look over or around an intervening obstacle, or to view objects in a dangerous location or environment while the observer is in a safer location or environment.
- a submarine periscope is the typical example, but many other applications, both military and non-military, are envisioned.
- FIG. 1 illustrates the simplest form of a prior art periscope 2 , having a pair of optical elements 4 and 6 , e.g., a pair of folding mirrors, which are used to allow a viewer to see over a nearby obstacle.
- the basic geometry of this embodiment imposes limitations on the performance of the system. This is especially true for systems with a very wide FOV and a constraint on the distance, l, between the folding-in optical element 4 and the folding-out element 6 .
- EMB eye-motion-box
- the required EMB 8 is 50 mm
- the required vertical FOV is 42°.
- the required input aperture 18 must be 325 mm. This is a relatively large aperture that necessarily increases the size of the entire system. If, however, only a smaller input aperture 20 of 200 mm is used, the obtainable vertical FOV 22 decrease to 23°, which is nearly half of the required FOV.
- the most common method to achieve both a small aperture and a wide FOV is to transmit the light pattern from the folding-in aperture into the folding-out aperture via a relay lens, or a train of relay lenses, usually having a unity of magnification. While this method is used for many applications and can usually provide the user with a sharp and bright image, it still suffers from some drawbacks, especially for systems where high performance is required. Firstly, it is desirable to minimize the number of relay stages in the relay train, both to maximize transmittance and to minimize the field curvature caused by the large number of positive lenses. Secondly, the outside diameter of the relay train is typically restricted, which can impose some severe restrictions on the optical design of the system. Thirdly, economic considerations make it desirable to minimize the total number of optical elements.
- FIG. 3 schematically illustrates a conventional folding optics arrangement, for both HUDs and HMDs wherein the optical system 2 is illuminated by a display source 24 .
- the display is collimated by a collimating lens 26 .
- the light from the display source 24 is folded by a first reflecting optical element 4 , while a second reflecting optical element 6 folds the light out into the EMB 8 of a viewer.
- a limited FOV As seen in the Figure, the maximum allowed off-axis angle ⁇ inside the substrate is:
- ⁇ max arc ⁇ ⁇ tan ⁇ ( T - d eye 2 ⁇ l ) , ( 1 ) wherein T is the substrate thickness;
- l is the distance between reflecting elements 4 and 6 .
- FIG. 4 illustrates a solution to this problem according to the present invention.
- two of the horizontal edges of the mechanical body of a common periscope are replaced with two pairs of parallel reflecting surfaces, 28 a , 28 b and 30 a , 30 b , respectively.
- the reflecting surfaces 28 a and 30 a converge with respect to each other, while the reflecting services 28 b and 30 b diverge with respect to each other, in the direction of the output aperture 20 .
- the two pairs form a continuous surface, namely, the edges of the surfaces 30 a and 28 b , and respectively, 28 a and 30 b contact each other, forming two contiguous surfaces in cross-section in the configuration of a bow-tie.
- the central part of the device is a free-space media and the rays traverse this media from the input aperture to the output aperture 20 without any reflectance.
- the rays from the lower part of the FOV are reflected from surfaces 28 a and 28 b
- the rays from the upper part of the FOV are reflected from surfaces 30 a and 26 b . Since the rays that enter the EMB 8 are either traveling directly from the input aperture or reflected twice from a pair of parallel surfaces, the original direction of each ray is maintained, and the original image is not affected.
- the output image at the EMB 8 is composed of three parts: a central part of the optical waves, which is not reflected by either of the pairs of parallel reflecting surfaces, and two side parts which are reflected twice by the surfaces 28 a , 28 b ; 30 a , 30 b . These three parts must be combined properly to form a smooth image to the eyes of the viewer, without any stripe or ghost images.
- the direction of the rays is inverted from the EMB 8 to the input aperture 10 .
- Each ray which is reflected by surfaces 28 a and 30 b is also reflected by surface 28 b , and respectively, 30 a before it impinges on input aperture 20 .
- the two pairs of parallel reflecting surfaces that are illustrated in FIG. 4 are identical and symmetrical about the optical axis of the device, however, the two pairs of parallel reflecting surfaces, need not necessarily be identical to each other and an asymmetrical system with different pairs can be utilized according to desired upper and lower angles of the FOV. Moreover, for systems where only one of the FOVs is to be increased (either the upper or the lower), only one pair of parallel reflecting surfaces is required to obtain a desired FOV. In addition, not only the vertical FOV can be increased by this method. There are systems, especially for navigating and/or driving, wherein the horizontal FOV is more important, and thus, it can be increased. Furthermore, the FOV can be increased in both the horizontal and the vertical axes, however, special care must be taken to prevent cross-talk between the horizontal and the vertical pairs.
- the purpose of the optical device according to the present invention is to transfer light within a given field-of-view (FOV) of angles, between a minimal angle ⁇ min and a maximal angle ⁇ max .
- the optical device comprises an input aperture, an output aperture remotely located from said input aperture, such that a light wave, located within the said FOV, that enters the optical device through the input aperture, that is, having an incident angle ⁇ such that ⁇ min ⁇ max , exits said optical device through the output aperture, and having at least one pair of parallel reflecting surfaces.
- Part of the light waves located within the FOV that enters the input aperture passes directly in free space to the output aperture without being reflected, while another part of the light waves entering the input aperture within the FOV, arrives at the output aperture after being twice reflected by the pair of parallel reflecting surfaces.
- the reflecting surfaces 28 a , 28 b , 30 a , 30 b which are illustrated in FIG. 4 , are simple mirrors that obey the first Snell law, that is, that the incident angle is equal to the reflected angle at the surface. There are cases, however, where it is preferred to use two parallel diffraction gratings instead, wherein the reflected angle at the surface is not equal to the incident angle. It is true that, for a given incident angle the reflected angle depends on the wavelength of the incident ray. If the grating functions of the two gratings are identical, however, then the reflected angle at the second reflecting surface will be equal to the incident angle at the first reflecting surface for all wavelengths.
- FIG. 4 is an example illustrating a simple implementation of this method.
- the use of pairs of parallel reflecting surfaces in order to decrease the aperture of the device for a given FOV, or alternatively, to increase the useable FOV for a given aperture is not limited to periscopes and it can be utilized in other optical devices where the input aperture is located far from the output aperture, including, but not limited to, free-space systems such as HUDS, HMDs, and the like.
- the FOV of the optical system can be increased by using the same structure as described with reference to FIG. 3 by adding to it two pairs of parallel mirrors 42 a , 44 b , 44 a and 42 b , as shown in FIG. 4 .
- FIGS. 6A and 6B illustrate a side view and a top view of a substrate-mode optical device 46 of the present invention, comprising a light-transmitting substrate 48 having at least two major parallel surfaces 50 , 52 , and lateral edges 54 , 56 , an optical element 4 for coupling the light from the display source 24 via a collimating lens 26 into the substrate 48 by total internal reflection, and one or more at least partially reflecting optical elements 6 located in the substrate, for coupling the light into the EMB 8 of a viewer.
- part of the two lateral edges 54 , 56 of the substrate 48 are provided with two pairs of parallel reflecting surfaces 58 a , 58 b , 60 a , 60 b , similar to the two pairs of parallel mirrors 28 a , 28 b and 30 a , 30 b of FIG. 4 .
- the angles between the rays trapped inside the substrate 48 and the reflecting surfaces 58 a , 58 b , 60 a , 60 b are sufficiently large so as to affect total internal reflection. As such, no special reflecting coating is required for these surfaces and they are merely polished surfaces.
- the combination of the present invention with a substrate-mode configuration yields a compact and convenient optical system having a satisfactory optical performance with a wide FOV.
- FIGS. 6A and 6B is an example of a method for coupling the input waves into the substrate.
- Input waves could, however, also be coupled into the substrate by other optical means, including, but not limited to, folding prisms, fiber optic bundles, diffracting gratings, and others.
- the input waves and the image waves are located on the same side of the substrate, other configurations are envisioned, in which the input and the image waves are located on opposite sides of the substrate. There may even be applications in which the input waves can be coupled into the substrate through one of the substrate's lateral edges.
Abstract
Description
wherein T is the substrate thickness;
Claims (16)
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
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IL157836A IL157836A (en) | 2003-09-10 | 2003-09-10 | Optical devices particularly for remote viewing applications |
IL157,836 | 2003-09-10 |
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US20050078388A1 US20050078388A1 (en) | 2005-04-14 |
US7021777B2 true US7021777B2 (en) | 2006-04-04 |
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US10/937,185 Active US7021777B2 (en) | 2003-09-10 | 2004-09-09 | Optical devices particularly for remote viewing applications |
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US (1) | US7021777B2 (en) |
EP (1) | EP1515173B1 (en) |
AT (1) | ATE374955T1 (en) |
DE (1) | DE602004009258T2 (en) |
ES (1) | ES2295807T3 (en) |
IL (1) | IL157836A (en) |
WO (1) | WO2005024485A1 (en) |
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US20050078388A1 (en) | 2005-04-14 |
WO2005024485B1 (en) | 2005-05-06 |
IL157836A (en) | 2009-08-03 |
ATE374955T1 (en) | 2007-10-15 |
DE602004009258T2 (en) | 2009-04-09 |
ES2295807T3 (en) | 2008-04-16 |
WO2005024485A1 (en) | 2005-03-17 |
EP1515173A1 (en) | 2005-03-16 |
DE602004009258D1 (en) | 2007-11-15 |
EP1515173B1 (en) | 2007-10-03 |
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